Most of the carbon sources such as graphite, carbon nanotubes are acting as magic bullets through heterogenous pathway, which not only paveway for high selectivity during the reaction pathway as well as easy recovery. Tend to be cost effective in synthesizing of nanoparticles by using transition metal posses variable oxidation states.
Nanoparticles have a very large surface area, which is a prerequisite for a heterogeneous catalyst. Nanocomposite is a multiphase bulk solid material. It looks like you mixed in your proposal three well sound key words, "pincer complexes," nanoparticles and nanocomposite without deep understanding what is behind of these words. What about a recovery of nanoparticles from a reaction mixture?
Alone nanoparticles will have less stability but when they were supported with any carbon source such as graphene oxide using certain coupling agents such as silane compounds, they tends to increase the activity of the catalyst along with stability which helps in easy recovery through filtration techniques. One can check the amount of nanoparticle leached out after the reaction by using ICP-AES analysis with the filtered catalyst.
The recovery of any heterogeneous catalyst depends on the type of metal precursor used for nanoparticle synthesis as well as supporting material to immobilize on it.
The original question was about nanocomposites . Now you are talking about nanoparticles supported on the surface of "carbon source," which are NOT nanocomposite. You did not answer my questions
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